With Emet out, you just need to crack a Clue to flip her over and start using those sweet, sweet abilities
Thats literally any kind of token, including treasure tokens - which are really easy to create thanks to the popularity of the mechanic, and cost nothing to sacrifice, too
The Upgrades There are the handful of relatively cheap equipment that work great with Cloud like Loxodon Warhammer which bumps Cloud's power to 7 and gives him evasion and lifelink, or Sunforger which also bumps up Cloud to the magic number but also gives us a ton of free tutorable interaction each turn
Since your goal with Sephiroth is to flip him as soon as possible, and you need four death triggers in a turn to make that happen, Nether Traitor can help you achieve that with three creatures rather than four
Common cards are identified by a Grey Circle
It may seem counter-intuitive to many people that a type of booster pack is sold for a collectible card game that isnt necessarily intended for play, but Collector Booster packs are intended to provide the best looking selection of cards in any given pack and may be just used for bragging rights, instead of being handled and shuffled in actual decks, during fraught games of MTG